SCEV: migrate LoopInvariantPredicate to CmpPredicate (NFC) (#125204)

Follow up on 60dc450 (SCEV: migrate to CmpPredicate (NFC)) to migrate
the missed ScalarEvolution::LoopInvariantPredicate to CmpPredicate.

Author: artagnon

llvm/include/llvm/Analysis/ScalarEvolution.h

@@ -1188,21 +1188,19 @@ class ScalarEvolution {
                             ICmpInst::Predicate Pred);
 
   struct LoopInvariantPredicate {
-    ICmpInst::Predicate Pred;
+    CmpPredicate Pred;
     const SCEV *LHS;
     const SCEV *RHS;
 
-    LoopInvariantPredicate(ICmpInst::Predicate Pred, const SCEV *LHS,
-                           const SCEV *RHS)
+    LoopInvariantPredicate(CmpPredicate Pred, const SCEV *LHS, const SCEV *RHS)
         : Pred(Pred), LHS(LHS), RHS(RHS) {}
   };
   /// If the result of the predicate LHS `Pred` RHS is loop invariant with
   /// respect to L, return a LoopInvariantPredicate with LHS and RHS being
   /// invariants, available at L's entry. Otherwise, return std::nullopt.
   std::optional<LoopInvariantPredicate>
-  getLoopInvariantPredicate(ICmpInst::Predicate Pred, const SCEV *LHS,
-                            const SCEV *RHS, const Loop *L,
-                            const Instruction *CtxI = nullptr);
+  getLoopInvariantPredicate(CmpPredicate Pred, const SCEV *LHS, const SCEV *RHS,
+                            const Loop *L, const Instruction *CtxI = nullptr);
 
   /// If the result of the predicate LHS `Pred` RHS is loop invariant with
   /// respect to L at given Context during at least first MaxIter iterations,

llvm/lib/Analysis/ScalarEvolution.cpp

@@ -11165,17 +11165,16 @@ ScalarEvolution::getMonotonicPredicateTypeImpl(const SCEVAddRecExpr *LHS,
 }
 
 std::optional<ScalarEvolution::LoopInvariantPredicate>
-ScalarEvolution::getLoopInvariantPredicate(ICmpInst::Predicate Pred,
-                                           const SCEV *LHS, const SCEV *RHS,
-                                           const Loop *L,
+ScalarEvolution::getLoopInvariantPredicate(CmpPredicate Pred, const SCEV *LHS,
+                                           const SCEV *RHS, const Loop *L,
                                            const Instruction *CtxI) {
   // If there is a loop-invariant, force it into the RHS, otherwise bail out.
   if (!isLoopInvariant(RHS, L)) {
     if (!isLoopInvariant(LHS, L))
       return std::nullopt;
 
     std::swap(LHS, RHS);
-    Pred = ICmpInst::getSwappedPredicate(Pred);
+    Pred = ICmpInst::getSwappedCmpPredicate(Pred);
   }
 
   const SCEVAddRecExpr *ArLHS = dyn_cast<SCEVAddRecExpr>(LHS);
@@ -11203,7 +11202,7 @@ ScalarEvolution::getLoopInvariantPredicate(ICmpInst::Predicate Pred,
   // A similar reasoning applies for a monotonically decreasing predicate, by
   // replacing true with false and false with true in the above two bullets.
   bool Increasing = *MonotonicType == ScalarEvolution::MonotonicallyIncreasing;
-  auto P = Increasing ? Pred : ICmpInst::getInversePredicate(Pred);
+  auto P = Increasing ? Pred : ICmpInst::getInverseCmpPredicate(Pred);
 
   if (isLoopBackedgeGuardedByCond(L, P, LHS, RHS))
     return ScalarEvolution::LoopInvariantPredicate(Pred, ArLHS->getStart(),